Motor mechanism for violin-players.



H. K. SANDELL.

MOTOR MECHANISM FOR VILIN PLAYERS.

APPLICATION FILED DEC. I9. |914.

1,262,266'. Patented Apr. 9, 19m

2 SHEETS-SH EET 2.

TED errances rmi T @FFI E HENRY K. SANDELL, 0F CHICAGO, ILLINOIS,ASSIGNR TO MILLS NOVELTY COMPANY, '0F CHICAGO, ILLINOIS, A CORPORATIONOF ILLINOIS.

MOTOR MECHANISM FOR VIOLIN-PLAYERS.

Specification of Letters Patent.

Patented Apr. 9, 1918.

Application filed December 19, 1914. Serial No. 878,068.

useful improvements in motor mechanism for violin players and is fullydescribed and explained in the specification andshown in theaccompanying drawings, in which:-

Figure 1 is a top plan of my improved motor; Fig. 2 is a side elevationlooking from the left of Fig. 1; Fig. 3 is a section I. on the .line 3of Fig. 2 ;-Fig. 4 is a diagrammatic view of the circuit, and Fig. 5 isa'nother diagrammatic view of the circuit.

Referrin to the drawings, 5 is a roller of conductlng material. Forpractical use in the violin player, the paper note-sheet passes overthis roller and the perforations therein enable any one of a series ofbrushes to make electrical contact with the roll. Such brushes arediagrammatically shown in Fig. 4, and their operation will be herein-VVafter explained in detail. 6 is the armatureY of the motor, the samebeing provided with a commutator upon which bear brushes 8., The fieldsare energized by four magnets at the corners. Each has a central ironcore and'is provided with several windings as will now be set forth. Onemagnet has two coils 9 and 10, the next, two coils 11 and 12, the next,two coils 13 and 14, and the fourth magnet a single coil 15, the windingof the coil 12 beingpreferably of lower resistance per term than thewinding of the coil 10. In the motors which I construct, I find itconvenient to make the coils 9, 10, 11, 12 and 13 of 125 ohmsresistance, the coil 14 of 600 ohms resistance, the coil 15 of 160 ohmsresistance, and the armature of 150 ohms resistance. Of course, thesefigures can be widely varied but from al consideration of them theproportions which the several coils bear to each other and the resultantelectrical effects thereby produced can bey more readily understood. Thetop of the motor bears an insulating block upon which are eightelectrical terminals numbered 16 to 23, inclusive. The terminal 16 isconnected by a wire 24 to one pole of the source of curof the source ofcurrent.

rent, the metallic roll 5 being connected to the same pole. The terminal16 is also connected to one end of the coil 9 of one magnet, theopposite end being connected to the terminal 17 The terminals 17 and 18are connected to opposite ends 'of the inner coil 11 of the next magnet.The terminals 18 and 19 are respectively connected to opposite ends ofthe inner coil 13 or the next succeeding magnet. The terminals 19 and 2Oare connected to the two brushes and also to the two terminals of thefield-magnet coil 14, which is, therefore, in parallel with the armatureat all times. The terminals 20 and 21 are connected to opposite ends ofthe field coil 15, the terminal 21 also being connected to the oppositepole of the source of current.

So far I have described the connections of the coils 9, 11, 13, 14, 15and the armature 6, and it is now possible to ex lain the man* ner inwhich four of the spec s of the motor are obtained. Under normalconditions all of the brushes will be held oif of the metallic roll 5 bythe note-sheet which will intervene and the. motor will run at what Iwill hereafter term normal speed.4 The circuit will,

be as follows:-

(i From onepole of the source of current to the terminal .16, thencethrough the coil 9 to the terminal 17, thence through the coil 11 to theterminal 18, thence through the coil 13 to the terminal 19, thencethrough the armature and the parallel eld coil 14 to the terminal 20,thence through the coil 15 to the terminal 21, and so to the oppositepole A higher speed is produced when the brush which is desi nated 25 isin contact with the metallic ro l. The current passes then from one poleof the source of current, through the metallic roll and the brush 25direct to the terminal 17, the circuit being therefore just as before,excepting that the coil 9 is omitted as heretofore set forth.Manifestly, these arrangements give three speeds higher than theso-called normal spee t The coils 10 and 12 are operative in givinglower speeds than the normal. The coil is connected to the terminals 2Oand 22 and the coil 12 is connected to the terminals 22 and 23, to whichare connected two other brushes 28 and 29, respectively.

If the brush 28 bears on the roll 5, in the absence of any other brush,the motor will be running at and receivin current as under normalcondition. In adtglition, a separate circuit. will be set up through thebrush 28, terminal 22, coil 10 to the terminal 20, thence through thecoil 15 to the termlnal 21 and so to the other pole of the source ofcurrent. The coil 10 will thus be energized and the coil 15 will receiveconsiderable additional current the field being thus greatlystrengthened. lf the brush 29, on the other hand, bears on the roll 5,an additional current will pass in through the terminal 23 and coil 12to the terminal 22, whence itl will flow in the course just traced. Thiswill roduce a still further strengthening of the elds and consequentstill slower s eed.

-While, of course, it might be possib e to use certain of the brushessimultaneously and so get additional permutations, for most urposes thesix speeds thus described will lie suflicient, and I find, in practice,that by the arrangement set forth the widest possible variations ofspeed can be obtained so that the violin-playing bow, which is driven bythis motor, produces all the shades of eX- pression whichmay be desired.

I realize that considerable variation is possible in the details ofconstruction herein shown, and I do not intend to limit myself thereto,except as pointed out in the following claims, 1n which it is myintention to claim all the novelty inherent in the device as broadly asis permitted by the state of the art.

What I claim as new and desire to secure by Letters Patent is 1. In amotor mechanism for violin players and the like and in combination, amotor having in its field a plurality of magnetic bodies surrounded byexciting coils, certain of which are adapted to be connected in seriesand others of which are adapted to be connected in shunt, connectionsfor leading current through certain of said series coils to drive themotor at normal speed, a contact roll over which a perforated musicsheet is adapted to be passed and arranged to be connected with one poleof a source of current, 60 a series of brushes adapted to bear on thecontact roll through openings vin the music sheet and havin connections,res ectively, with different points in the series fie d circuit betweenthe co1ls thereof to'short circuit certain of the coils when inelectrical contact with the contact roll, and other brushes adapted tobear on the contact roll and having connection with said shunt coilswhereby the shunt coils may be controlled to vary the s eed of themotor.

'2. n a motor mechanism for violin players and the like and incombination, a motor having four magnetic bodies in its field, three ofwhich are surrounded by two windings and one of which is surrounded byone win ing only, means normally to lead current in series through oneof the two windings of the three coils havin double windings, throu hthe armature an through the single woun field-coil the second coil ofone of the magnetic bodies being connected in parallel with thearmature, a contact roll over which a perforated music sheet is adaptedto be passed and having connection with one pole of the source ofcurrent, three brushes adapted to contact therewith through the openingsin the music sheet for' short circuitin the series coils of the threemagnets, where y to give three speeds higher than the normal speed.

3. In a motor mechanism for violin players and the like and incombination, a motor having four magnetic bodies in its field, three ofwhich are surrounded by two windings and one of which is surrounded byone winding only, means normally to lead current in series through oneof the two windings of the three co11s having double windings, throughthe armature and through the single wound field-coil, the second coil ofone of the ma netic bodies being connected in parallel wit the armature,a contact roll over which a perforated music sheet is adapted to bepassed and having connection with one pole of the source of current,three brushes adapted to contact therewith through the openings in themusic sheet for short-circuiting the series coils of the three magnets,whereby to give three speeds higher than the normal speed, and two otherbrushes adapted respectively to lead current through one and both of theremaining coils of the double-wound magnets, giving lower speeds thanthe normal speed.

In testimony whereof I have hereunto set my hand this 7th da ofDecember, 1914. HE RY K. SANDELL. In presence of two subscribingwitnesses:

Nnnnm B. DmnBonN, A. C. Frsoman.

